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Post by carasdad on Jul 1, 2013 16:36:41 GMT -5
Sounds like raising the needle might help I would start there. How many miles?? When was the last time the combustion chamber was decarboned?? Did this just start happening or has it always been?? It's a new Adly...has 470 miles on it. So shouldn't be carboned up. |
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Post by carasdad on Jul 1, 2013 8:47:24 GMT -5
Losing my zip...  I have a new Adly 50cc 2T. When cold and enricher is on..0-20 is brisk..from there it 'comes up on the pipe' and you are gone from 20-55 in a flash! Problem is...once it warms up after a minute or two and the enricher kicks off...0-20 is a tad bit sluggish. BUT..once you hit 20-25 and it 'comes up on the pipe'..zoom..you are off and flying. I love the initial jet like take off until the engine warms up...then the 0-20 speed goes away so that pulling out into traffic makes me nervous. I have adjusted the A/F many times..many ways..yet this persists...telling me it likes the fuel boost the enricher gives until it closes off when warm. So is my scoot asking for a bigger pilot jet?..needs the needle raised a notch..or is this just common for 2T's? Cause my Jonway Hornet I traded never did that..nor did my Benelli Andretti 50.  |
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Post by carasdad on Jun 30, 2013 21:16:43 GMT -5
[replyingto=millsc]millsc[/replyingto]One sold in 3 minutes...got one left... It has intake lobe widest point is 25.78 exhaust widest point 25.67.. lift is 5.86 LSA (Lobe seperation angle) is 119 degrees. Meeting the criteria for an A9 cam
Also have a slightly used (20 miles or so A8 cam) It has intake lobe widest point is 24.48 exhaust widest point 24.52.. lift is 5.02 LSA (Lobe separation angle) is 116 degrees. Which meets the criteria for an A8 cam.
A8 is a good midrange cam for stop and go city traffic...where you get a quicker take off. A9 has great midrange but really excels in top end for you speed freaks...on a good running BBK engine with a level surface and proper roller weights...you will go beyond redline and 50+mph.
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Post by carasdad on Jun 30, 2013 18:19:42 GMT -5
Pulling the base gasket and just using a head of rtv is a common practice. Also running ncy flat SS valves will help bump up compression. Be careful though too much compression will cause detonation without proper octane fuel.  And compression above 180 can cause other damage to the engine, causing crank failure, damage to the piston... If your wanting more compression for more power it's better to just do a bbk.. WHAT LARRY SAID!!..He and I have pistons and cranks to prove the massive destruction from running your compression too high! See the pic of the pistion? It used to be a small dome top..now look what compression...excess heat from it..and detonation from the compression caused. From a small top..to a 4mm deep concave piston now. Engine wouldn't even run anymore.. Attachments:
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Post by carasdad on Jun 30, 2013 17:40:05 GMT -5
4 sale. 2 brand new unused 139qmb A9 cams. Best for mid range and screaming top end power.Shows its true power with a BBK...but will work on a stock engine. $25.00 shipped...each. Attachments:
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Post by carasdad on Jun 29, 2013 22:18:16 GMT -5
[replyingto=justin010304]justin010304[/replyingto]The majority of the time..prolly  %...when you need a PCV valve due to excessive air and a foamy oil mixture coming from your valve cover vent...your rings are worn and you have blow by. I have tried the PCV valve in several scoots with that condition. All they do is allow air to flow one way..that being out. But your blow gasses will still come out because the one way PCV allows it to vent as it needs to. A PCV valve is only a band aid on a bigger problem. If you have blow by now...you will still have it with PCV... Been there...done that on at least 15 customer QMI125 and QMJ150 scoots. Ended up doing a ring job...and *POOF*...good as new with no blow by..  Glenn |
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Post by carasdad on Jun 28, 2013 21:12:49 GMT -5
Here is what the stroke was.. Attachments:
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Post by carasdad on Jun 28, 2013 21:12:02 GMT -5
Well.. a tear down to check things out. D@mn thing is like the Retro Scoots...where ya gotta take of ALL the body plastic to get to the engine. Even then it's cramped quarters with all the frame bracing welded on this thing. Only thing diff from other Minarelli engines I saw was..the cdi was a 4 wire 2 plug connector similar to a GY6 CDI. CDI itself is marked 'advancing angle' with a bunch of numbers below that. The carb is not 18mm like my Jonway Hornet Minarelli was...it is a 20mm Arreche. The oik pump is a Mikuni. There is a sticker under the seat bucket that says 20mm pilot jet..82 main jet. 82 seems too large to me as most 50cc 2T's have a #68-#74...but hey it works and works well. Measured the cylinder 3 times at 3 different angles and got 39.96-39.98. Then I measured the stroke a few times and got 39.18-39.12 that is only 6/100's of a mm difference. So it meets the specs of a stock 50 stroke which is 39.2 and the bore meets the specs for a stock 50 bore. So what we have here is a 55mph stock 50cc Scoot..bizarre. ryan on here rode along with me and can verify how fast it is. Down side of things is when he was here..we looked at the roller weights..and with only 501 miles on the Scoot they were warn with SEVERE flat spots. Must have come with cheapies to save them 75 cents? Anyway..my findings.. the 20mm Arreche carb and true advancing angle CDI(checked with a timing light) those 2 things CANNOT possibly be why it is so quick. But everything checks as stock....stock...stock..Minarelli. Regardless..currently looking for suggestions for a good quality high performing BBK. Please give me links and input as I Googled so many I got a headache..and few gave any real info or specs. Just "47mm bore,turn your 50 into a powerful 72"...and other useless info like that. Attachments:
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Post by carasdad on Jun 28, 2013 6:39:15 GMT -5
Duddddeeee that scooter is sweet!!! 2T all the way!!! Sounds like a real beast. So basically you got to ride a practically new 2T for 2 years for free and got the Aldy for $300??  That is exactly how it panned out. I rode the Jonway Hornet 2 years..guy had a 2012 Peace Sports B09 with 100 BKK and loads of other performance parts. Kept asking me to trade cause he liked 2T's and ride mine. He was blown away by the take off and speed...again bugging me to trade. So I did..an old scoot for a brand new one..hmm sure deal. Built many fast 139QMB powered scoots..so figured I would do the same with that one. Rode it Jerry's business and a 16 yo kid saw it and said."See something like that is what I want, a taller Scooter,these others are too tiny" Kid was 6' 4" at 16!  I said take it for a ride...and he came back happy. Long story short..Jerry took me aside and not wanting to lose a customer from a family he gets lots of business for he traded me the Adly and sold the Peace Sports to the. So we all came out happy.  @larry..I have my fingers crossed bud...hoping the same stroke of 'bad luck' comes your way... ;D Hey hope Fawkes is coming along well. That build of yours was a HUGE inspiration to many newbies and old timers here.. |
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Post by carasdad on Jun 27, 2013 19:19:48 GMT -5
[replyingto=carasdad]carasdad[/replyingto]Pic #2... Attachments:
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Post by carasdad on Jun 27, 2013 19:19:21 GMT -5
Ok...2 years ago while working as a mechanic in a Scooter shop...we had a 2008 Jonway Hornet 2T. The owner had disassembled it to use for parts. Not 1 mile had ever been put on the Scoot. looking over the pile of parts..all that was missing were the headlight bulbs...Voltage Regular..Speedometer...Stator and front turn signals. Very few 2T's in our area so it just sat there. I asked to buy it as is..and he said ok..how 'bout $400.00..well $300.00 cause you covered the shop a whole day while we were at the Beach Fest. I took it. Browsing through our warehouse one day I saw 4 Jonway Rally 2T's in various arrays of disassembley...and pulled the parts I needed from them.I asked him how much...he said 25 bux for all.Took them too and the MCO home. Built a real screamer out of it 2 days.Rode it 2 years then traded it for a 2012 Peace Sports B09 that had a 100 BBK and lots of other performance parts.Mint condition but kinda a slug due to it too high gearing.Swapped the clutch and Contra springs and it came to life.Rode it to visit my ex boss/best bud who told me was looking for a B09 for customer with a 6' 4" 16 yo that was not comfy on the smaller scoots...needed one of the 150 size 50's. So he told me had a 2T he would swap so he could sell the kid the bigger Scoot and make a lil profit. Ok here's the part where I get screwed...he opens the shop..wheels out an Adly 'Thunder 50'...with only 477 miles on it...MINT condition...techingas pipe sounded sweet! I said yer joking right? He said nope...now with our second baby I have to drive an SUV wit 2 cars seats everywhere. Test ride...0-20 is ok...then it comes up on the pipe and you are only 15 seconds or so from 56mph. So I did the swap and what ya see in the pics is what I got stuck with....lol..... Attachments:
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Post by carasdad on Jun 27, 2013 8:42:26 GMT -5
[replyingto=carasdad]carasdad[/replyingto]Here is another view. Once we got the compression at or below 180..we later checked the piston after 1,000 miles. Looked fresh as new.. Attachments:
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Post by carasdad on Jun 27, 2013 8:40:48 GMT -5
may be this is a better pic......... This what happens to the piston when compression is too high. Larry's was 205 as he said...this guys scoot I fixed was 235-240. Look at the bowl shape of the piston in the following 2 pics. Attachments:
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Post by carasdad on Jun 27, 2013 8:12:27 GMT -5
carasdad were you running a stock head on those or big valve heads? buford1488 what do you mean cut the combustion chamber? Stock head with the extra gaskets...or with scrappydogs head you don't need them...just standard gaskets as they cut a relief area in the head to lower compression. |
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Post by carasdad on Jun 27, 2013 5:00:56 GMT -5
We have 2 with them..one is over 5,000...the other over 6,000. What eats them up..is improper install. Folks will slap one on and end up with a compression of 240psi and have seen even higher !! Starter cannot crank it...and I could BARELY kick it over. Needles to say on both..the cranks did not last...nor did the pistons. The detonation..heat caused by it and super high compression made the flat top pistons bowl shaped excessively. When built ours we added an extra base gasket and head gasket. This kept the pressure about 180 psi...and not a single issue in their 5,000-6,000 miles.Bottom line...a little common sense and mechanical knowledge go a long way. ;D |
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%...when you need a PCV valve due to excessive air and a foamy oil mixture coming from your valve cover vent...your rings are worn and you have blow by. I have tried the PCV valve in several scoots with that condition. All they do is allow air to flow one way..that being out. But your blow gasses will still come out because the one way PCV allows it to vent as it needs to. A PCV valve is only a band aid on a bigger problem. If you have blow by now...you will still have it with PCV... Been there...done that on at least 15 customer QMI125 and QMJ150 scoots. Ended up doing a ring job...and *POOF*...good as new with no blow by.. 
